kcmkwin/rules: Fix suggested values for virtual desktops rule
If the virtual desktops rule is created, only the last virtual desktop the window is on is going to be checked.
With this, all virtual desktops that the window is currently on will be checked.
Technically, it's an api breaking change, but the window rules kcm is the primary user of queryWindowInfo() so I don't think it's a big deal.
Edited by Vlad Zahorodnii